v4.19.13 snapshot.
diff --git a/drivers/media/common/videobuf2/videobuf2-vmalloc.c b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
new file mode 100644
index 0000000..6dfbd5b
--- /dev/null
+++ b/drivers/media/common/videobuf2/videobuf2-vmalloc.c
@@ -0,0 +1,451 @@
+/*
+ * videobuf2-vmalloc.c - vmalloc memory allocator for videobuf2
+ *
+ * Copyright (C) 2010 Samsung Electronics
+ *
+ * Author: Pawel Osciak <pawel@osciak.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation.
+ */
+
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/mm.h>
+#include <linux/refcount.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/vmalloc.h>
+
+#include <media/videobuf2-v4l2.h>
+#include <media/videobuf2-vmalloc.h>
+#include <media/videobuf2-memops.h>
+
+struct vb2_vmalloc_buf {
+ void *vaddr;
+ struct frame_vector *vec;
+ enum dma_data_direction dma_dir;
+ unsigned long size;
+ refcount_t refcount;
+ struct vb2_vmarea_handler handler;
+ struct dma_buf *dbuf;
+};
+
+static void vb2_vmalloc_put(void *buf_priv);
+
+static void *vb2_vmalloc_alloc(struct device *dev, unsigned long attrs,
+ unsigned long size, enum dma_data_direction dma_dir,
+ gfp_t gfp_flags)
+{
+ struct vb2_vmalloc_buf *buf;
+
+ buf = kzalloc(sizeof(*buf), GFP_KERNEL | gfp_flags);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+
+ buf->size = size;
+ buf->vaddr = vmalloc_user(buf->size);
+ buf->dma_dir = dma_dir;
+ buf->handler.refcount = &buf->refcount;
+ buf->handler.put = vb2_vmalloc_put;
+ buf->handler.arg = buf;
+
+ if (!buf->vaddr) {
+ pr_debug("vmalloc of size %ld failed\n", buf->size);
+ kfree(buf);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ refcount_set(&buf->refcount, 1);
+ return buf;
+}
+
+static void vb2_vmalloc_put(void *buf_priv)
+{
+ struct vb2_vmalloc_buf *buf = buf_priv;
+
+ if (refcount_dec_and_test(&buf->refcount)) {
+ vfree(buf->vaddr);
+ kfree(buf);
+ }
+}
+
+static void *vb2_vmalloc_get_userptr(struct device *dev, unsigned long vaddr,
+ unsigned long size,
+ enum dma_data_direction dma_dir)
+{
+ struct vb2_vmalloc_buf *buf;
+ struct frame_vector *vec;
+ int n_pages, offset, i;
+ int ret = -ENOMEM;
+
+ buf = kzalloc(sizeof(*buf), GFP_KERNEL);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+
+ buf->dma_dir = dma_dir;
+ offset = vaddr & ~PAGE_MASK;
+ buf->size = size;
+ vec = vb2_create_framevec(vaddr, size, dma_dir == DMA_FROM_DEVICE ||
+ dma_dir == DMA_BIDIRECTIONAL);
+ if (IS_ERR(vec)) {
+ ret = PTR_ERR(vec);
+ goto fail_pfnvec_create;
+ }
+ buf->vec = vec;
+ n_pages = frame_vector_count(vec);
+ if (frame_vector_to_pages(vec) < 0) {
+ unsigned long *nums = frame_vector_pfns(vec);
+
+ /*
+ * We cannot get page pointers for these pfns. Check memory is
+ * physically contiguous and use direct mapping.
+ */
+ for (i = 1; i < n_pages; i++)
+ if (nums[i-1] + 1 != nums[i])
+ goto fail_map;
+ buf->vaddr = (__force void *)
+ ioremap_nocache(__pfn_to_phys(nums[0]), size + offset);
+ } else {
+ buf->vaddr = vm_map_ram(frame_vector_pages(vec), n_pages, -1,
+ PAGE_KERNEL);
+ }
+
+ if (!buf->vaddr)
+ goto fail_map;
+ buf->vaddr += offset;
+ return buf;
+
+fail_map:
+ vb2_destroy_framevec(vec);
+fail_pfnvec_create:
+ kfree(buf);
+
+ return ERR_PTR(ret);
+}
+
+static void vb2_vmalloc_put_userptr(void *buf_priv)
+{
+ struct vb2_vmalloc_buf *buf = buf_priv;
+ unsigned long vaddr = (unsigned long)buf->vaddr & PAGE_MASK;
+ unsigned int i;
+ struct page **pages;
+ unsigned int n_pages;
+
+ if (!buf->vec->is_pfns) {
+ n_pages = frame_vector_count(buf->vec);
+ pages = frame_vector_pages(buf->vec);
+ if (vaddr)
+ vm_unmap_ram((void *)vaddr, n_pages);
+ if (buf->dma_dir == DMA_FROM_DEVICE ||
+ buf->dma_dir == DMA_BIDIRECTIONAL)
+ for (i = 0; i < n_pages; i++)
+ set_page_dirty_lock(pages[i]);
+ } else {
+ iounmap((__force void __iomem *)buf->vaddr);
+ }
+ vb2_destroy_framevec(buf->vec);
+ kfree(buf);
+}
+
+static void *vb2_vmalloc_vaddr(void *buf_priv)
+{
+ struct vb2_vmalloc_buf *buf = buf_priv;
+
+ if (!buf->vaddr) {
+ pr_err("Address of an unallocated plane requested or cannot map user pointer\n");
+ return NULL;
+ }
+
+ return buf->vaddr;
+}
+
+static unsigned int vb2_vmalloc_num_users(void *buf_priv)
+{
+ struct vb2_vmalloc_buf *buf = buf_priv;
+ return refcount_read(&buf->refcount);
+}
+
+static int vb2_vmalloc_mmap(void *buf_priv, struct vm_area_struct *vma)
+{
+ struct vb2_vmalloc_buf *buf = buf_priv;
+ int ret;
+
+ if (!buf) {
+ pr_err("No memory to map\n");
+ return -EINVAL;
+ }
+
+ ret = remap_vmalloc_range(vma, buf->vaddr, 0);
+ if (ret) {
+ pr_err("Remapping vmalloc memory, error: %d\n", ret);
+ return ret;
+ }
+
+ /*
+ * Make sure that vm_areas for 2 buffers won't be merged together
+ */
+ vma->vm_flags |= VM_DONTEXPAND;
+
+ /*
+ * Use common vm_area operations to track buffer refcount.
+ */
+ vma->vm_private_data = &buf->handler;
+ vma->vm_ops = &vb2_common_vm_ops;
+
+ vma->vm_ops->open(vma);
+
+ return 0;
+}
+
+#ifdef CONFIG_HAS_DMA
+/*********************************************/
+/* DMABUF ops for exporters */
+/*********************************************/
+
+struct vb2_vmalloc_attachment {
+ struct sg_table sgt;
+ enum dma_data_direction dma_dir;
+};
+
+static int vb2_vmalloc_dmabuf_ops_attach(struct dma_buf *dbuf,
+ struct dma_buf_attachment *dbuf_attach)
+{
+ struct vb2_vmalloc_attachment *attach;
+ struct vb2_vmalloc_buf *buf = dbuf->priv;
+ int num_pages = PAGE_ALIGN(buf->size) / PAGE_SIZE;
+ struct sg_table *sgt;
+ struct scatterlist *sg;
+ void *vaddr = buf->vaddr;
+ int ret;
+ int i;
+
+ attach = kzalloc(sizeof(*attach), GFP_KERNEL);
+ if (!attach)
+ return -ENOMEM;
+
+ sgt = &attach->sgt;
+ ret = sg_alloc_table(sgt, num_pages, GFP_KERNEL);
+ if (ret) {
+ kfree(attach);
+ return ret;
+ }
+ for_each_sg(sgt->sgl, sg, sgt->nents, i) {
+ struct page *page = vmalloc_to_page(vaddr);
+
+ if (!page) {
+ sg_free_table(sgt);
+ kfree(attach);
+ return -ENOMEM;
+ }
+ sg_set_page(sg, page, PAGE_SIZE, 0);
+ vaddr += PAGE_SIZE;
+ }
+
+ attach->dma_dir = DMA_NONE;
+ dbuf_attach->priv = attach;
+ return 0;
+}
+
+static void vb2_vmalloc_dmabuf_ops_detach(struct dma_buf *dbuf,
+ struct dma_buf_attachment *db_attach)
+{
+ struct vb2_vmalloc_attachment *attach = db_attach->priv;
+ struct sg_table *sgt;
+
+ if (!attach)
+ return;
+
+ sgt = &attach->sgt;
+
+ /* release the scatterlist cache */
+ if (attach->dma_dir != DMA_NONE)
+ dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
+ attach->dma_dir);
+ sg_free_table(sgt);
+ kfree(attach);
+ db_attach->priv = NULL;
+}
+
+static struct sg_table *vb2_vmalloc_dmabuf_ops_map(
+ struct dma_buf_attachment *db_attach, enum dma_data_direction dma_dir)
+{
+ struct vb2_vmalloc_attachment *attach = db_attach->priv;
+ /* stealing dmabuf mutex to serialize map/unmap operations */
+ struct mutex *lock = &db_attach->dmabuf->lock;
+ struct sg_table *sgt;
+
+ mutex_lock(lock);
+
+ sgt = &attach->sgt;
+ /* return previously mapped sg table */
+ if (attach->dma_dir == dma_dir) {
+ mutex_unlock(lock);
+ return sgt;
+ }
+
+ /* release any previous cache */
+ if (attach->dma_dir != DMA_NONE) {
+ dma_unmap_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
+ attach->dma_dir);
+ attach->dma_dir = DMA_NONE;
+ }
+
+ /* mapping to the client with new direction */
+ sgt->nents = dma_map_sg(db_attach->dev, sgt->sgl, sgt->orig_nents,
+ dma_dir);
+ if (!sgt->nents) {
+ pr_err("failed to map scatterlist\n");
+ mutex_unlock(lock);
+ return ERR_PTR(-EIO);
+ }
+
+ attach->dma_dir = dma_dir;
+
+ mutex_unlock(lock);
+
+ return sgt;
+}
+
+static void vb2_vmalloc_dmabuf_ops_unmap(struct dma_buf_attachment *db_attach,
+ struct sg_table *sgt, enum dma_data_direction dma_dir)
+{
+ /* nothing to be done here */
+}
+
+static void vb2_vmalloc_dmabuf_ops_release(struct dma_buf *dbuf)
+{
+ /* drop reference obtained in vb2_vmalloc_get_dmabuf */
+ vb2_vmalloc_put(dbuf->priv);
+}
+
+static void *vb2_vmalloc_dmabuf_ops_kmap(struct dma_buf *dbuf, unsigned long pgnum)
+{
+ struct vb2_vmalloc_buf *buf = dbuf->priv;
+
+ return buf->vaddr + pgnum * PAGE_SIZE;
+}
+
+static void *vb2_vmalloc_dmabuf_ops_vmap(struct dma_buf *dbuf)
+{
+ struct vb2_vmalloc_buf *buf = dbuf->priv;
+
+ return buf->vaddr;
+}
+
+static int vb2_vmalloc_dmabuf_ops_mmap(struct dma_buf *dbuf,
+ struct vm_area_struct *vma)
+{
+ return vb2_vmalloc_mmap(dbuf->priv, vma);
+}
+
+static const struct dma_buf_ops vb2_vmalloc_dmabuf_ops = {
+ .attach = vb2_vmalloc_dmabuf_ops_attach,
+ .detach = vb2_vmalloc_dmabuf_ops_detach,
+ .map_dma_buf = vb2_vmalloc_dmabuf_ops_map,
+ .unmap_dma_buf = vb2_vmalloc_dmabuf_ops_unmap,
+ .map = vb2_vmalloc_dmabuf_ops_kmap,
+ .vmap = vb2_vmalloc_dmabuf_ops_vmap,
+ .mmap = vb2_vmalloc_dmabuf_ops_mmap,
+ .release = vb2_vmalloc_dmabuf_ops_release,
+};
+
+static struct dma_buf *vb2_vmalloc_get_dmabuf(void *buf_priv, unsigned long flags)
+{
+ struct vb2_vmalloc_buf *buf = buf_priv;
+ struct dma_buf *dbuf;
+ DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
+
+ exp_info.ops = &vb2_vmalloc_dmabuf_ops;
+ exp_info.size = buf->size;
+ exp_info.flags = flags;
+ exp_info.priv = buf;
+
+ if (WARN_ON(!buf->vaddr))
+ return NULL;
+
+ dbuf = dma_buf_export(&exp_info);
+ if (IS_ERR(dbuf))
+ return NULL;
+
+ /* dmabuf keeps reference to vb2 buffer */
+ refcount_inc(&buf->refcount);
+
+ return dbuf;
+}
+#endif /* CONFIG_HAS_DMA */
+
+
+/*********************************************/
+/* callbacks for DMABUF buffers */
+/*********************************************/
+
+static int vb2_vmalloc_map_dmabuf(void *mem_priv)
+{
+ struct vb2_vmalloc_buf *buf = mem_priv;
+
+ buf->vaddr = dma_buf_vmap(buf->dbuf);
+
+ return buf->vaddr ? 0 : -EFAULT;
+}
+
+static void vb2_vmalloc_unmap_dmabuf(void *mem_priv)
+{
+ struct vb2_vmalloc_buf *buf = mem_priv;
+
+ dma_buf_vunmap(buf->dbuf, buf->vaddr);
+ buf->vaddr = NULL;
+}
+
+static void vb2_vmalloc_detach_dmabuf(void *mem_priv)
+{
+ struct vb2_vmalloc_buf *buf = mem_priv;
+
+ if (buf->vaddr)
+ dma_buf_vunmap(buf->dbuf, buf->vaddr);
+
+ kfree(buf);
+}
+
+static void *vb2_vmalloc_attach_dmabuf(struct device *dev, struct dma_buf *dbuf,
+ unsigned long size, enum dma_data_direction dma_dir)
+{
+ struct vb2_vmalloc_buf *buf;
+
+ if (dbuf->size < size)
+ return ERR_PTR(-EFAULT);
+
+ buf = kzalloc(sizeof(*buf), GFP_KERNEL);
+ if (!buf)
+ return ERR_PTR(-ENOMEM);
+
+ buf->dbuf = dbuf;
+ buf->dma_dir = dma_dir;
+ buf->size = size;
+
+ return buf;
+}
+
+
+const struct vb2_mem_ops vb2_vmalloc_memops = {
+ .alloc = vb2_vmalloc_alloc,
+ .put = vb2_vmalloc_put,
+ .get_userptr = vb2_vmalloc_get_userptr,
+ .put_userptr = vb2_vmalloc_put_userptr,
+#ifdef CONFIG_HAS_DMA
+ .get_dmabuf = vb2_vmalloc_get_dmabuf,
+#endif
+ .map_dmabuf = vb2_vmalloc_map_dmabuf,
+ .unmap_dmabuf = vb2_vmalloc_unmap_dmabuf,
+ .attach_dmabuf = vb2_vmalloc_attach_dmabuf,
+ .detach_dmabuf = vb2_vmalloc_detach_dmabuf,
+ .vaddr = vb2_vmalloc_vaddr,
+ .mmap = vb2_vmalloc_mmap,
+ .num_users = vb2_vmalloc_num_users,
+};
+EXPORT_SYMBOL_GPL(vb2_vmalloc_memops);
+
+MODULE_DESCRIPTION("vmalloc memory handling routines for videobuf2");
+MODULE_AUTHOR("Pawel Osciak <pawel@osciak.com>");
+MODULE_LICENSE("GPL");